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JEE Main 10 April 2015 Paper

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Question : 4

Total: 90

A block of mass m=0.1 kg is connected to a spring of unknown spring constant k. It is compressed to a distance x from its equilibrium position and released from rest. After approaching half the distance (

) from equilibrium position, it hits another block and comes to rest momentarily, while the other block moves with a velocity 3ms−1. The total initial energy of the spring is :

1.5 J
0.6 J
0.3 j
0.8 j

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